// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "dawn/native/opengl/PersistentPipelineStateGL.h"

#include "dawn/native/opengl/OpenGLFunctions.h"

namespace dawn::native::opengl {

void PersistentPipelineState::SetDefaultState(const OpenGLFunctions& gl) {
    CallGLStencilFunc(gl);
}

void PersistentPipelineState::SetStencilFuncsAndMask(const OpenGLFunctions& gl,
                                                     GLenum stencilBackCompareFunction,
                                                     GLenum stencilFrontCompareFunction,
                                                     uint32_t stencilReadMask) {
    if (mStencilBackCompareFunction == stencilBackCompareFunction &&
        mStencilFrontCompareFunction == stencilFrontCompareFunction &&
        mStencilReadMask == stencilReadMask) {
        return;
    }

    mStencilBackCompareFunction = stencilBackCompareFunction;
    mStencilFrontCompareFunction = stencilFrontCompareFunction;
    mStencilReadMask = stencilReadMask;
    CallGLStencilFunc(gl);
}

void PersistentPipelineState::SetStencilReference(const OpenGLFunctions& gl,
                                                  uint32_t stencilReference) {
    if (mStencilReference == stencilReference) {
        return;
    }

    mStencilReference = stencilReference;
    CallGLStencilFunc(gl);
}

void PersistentPipelineState::CallGLStencilFunc(const OpenGLFunctions& gl) {
    gl.StencilFuncSeparate(GL_BACK, mStencilBackCompareFunction, mStencilReference,
                           mStencilReadMask);
    gl.StencilFuncSeparate(GL_FRONT, mStencilFrontCompareFunction, mStencilReference,
                           mStencilReadMask);
}

}  // namespace dawn::native::opengl
